lightweight-ish option parsing with Ruby standard library

demo_option_parser.rb

# run with
# ruby tools/demo-option-parser.rb --skip-download
# or
# bundle exec rails runner tools/demo-option-parser.rb --skip-download

require 'optparse' # not needed for rails runner

skip = nil
p ARGV # ["--skip-download"]

OptionParser.new do |opts|

  opts.on("--skip-download") do |s|
    puts "hello #{s}" # "hello true"
    skip = s
  end
end.parse!

p skip # true
# ARGV has been emptied out
p ARGV # []

## alternative approach is to populate an options hash that the code refers to later
config = {
  file: 'project_images_from_faraday.json',
}

OptionParser.new do |parser|
  parser.on('--skip-download', 'Use a previously saved raw download instead of a fresh download.')
  parser.on('--file PATH', String, 'Temporary file to store raw download')
end.parse!(into: config)